1. ppt: Microsoft PowerPoint. A software by Microsoft which is designed to create and show slides on computer 2. paragraph/rule: In this text, one paragraph contains one rule to avoid foolish inions 3. the Internet Classroom: where Tsinghua students can communicate with teachers or among themselves after class. See Appendix F7 Notes: 1. ppt: Microsoft PowerPoint. A software by Microsoft which is designed to create and show slides on computer. 2. paragraph/rule: In this text, one paragraph contains one rule to avoid foolish opinions. 3. the Internet Classroom: where Tsinghua students can communicate with teachers or among themselves after class. See Appendix F